# Open AIR Mini

> Open-source ESP32-based ventilation controller for Ducobox Silent/Focus and Orcon MVS-15xx systems with optional CO2, humidity, VOC, and NOx sensors, fully compatible with ESPHome and Home Assistant.

## Quick Facts

- **Brand:** TheFlamingo
- **Board Type:** IoT Controller
- **Price:** ~$69.95
- **Product Readiness:** consumer
- **CPU:** ESP32
- **CPU Architecture:** Xtensa LX6
- **CPU Cores:** 2
- **RAM:** 520KB SRAM
- **Flash:** 4MB
- **USB:** Micro-USB (programming)
- **Power:** 230V AC
- **Operating Voltage:** 3.3V
- **Antenna:** Built-in PCB antenna

## Connectivity

- **Wifi:** WiFi 4 (802.11 b/g/n)
- **Bluetooth:** BLE 4.2

## Open Source

- **Firmware:** Yes
- **Schematics:** Yes
- **PCB Layout:** Yes
- **License:** GPL-3.0

## Compatible Firmware

esphome

## Use Cases

- ventilation-control
- indoor-air-quality
- smart-home
- hvac-control

## Components

- **ESP32-WROOM-32** (mcu): Espressif ESP32-WROOM-32 dual-core Xtensa LX6 module with 4MB flash, WiFi, and Bluetooth in a shielded package. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-wroom-32_datasheet_en.pdf&ref=openhardware.directory&product=open-air-mini&source=md-export)
- **Meanwell-AC-DC** (power-management): Onboard AC-DC converter providing 5V, 3.3V, and 10V regulated rails from 230VAC mains input. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.meanwell.com%2FproductPdf.aspx%3Fi%3D459&ref=openhardware.directory&product=open-air-mini&source=md-export)
- **SCD-4x** (environmental-sensor): Miniaturized photoacoustic NDIR CO2 sensor with integrated temperature and humidity measurement via I2C. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsensirion.com%2Fmedia%2Fdocuments%2F48C4B7FB%2F66E05452%2FCD_DS_SCD4x_Datasheet_D1.pdf&ref=openhardware.directory&product=open-air-mini&source=md-export)
- **SHT-4x** (environmental-sensor): Fourth-generation digital temperature and humidity sensor with I2C interface and high accuracy. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsensirion.com%2Fmedia%2Fdocuments%2F33FD6951%2F662A593A%2FHT_DS_Datasheet_SHT4x.pdf&ref=openhardware.directory&product=open-air-mini&source=md-export)
- **SGP-41** (environmental-sensor): Digital VOC and NOx gas sensor with I2C interface for indoor air quality index measurement. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsensirion.com%2Fmedia%2Fdocuments%2F5FE8673C%2F61E96F50%2FSensirion_Gas_Sensors_Datasheet_SGP41.pdf&ref=openhardware.directory&product=open-air-mini&source=md-export)
- **Senseair-S8** (environmental-sensor): NDIR CO2 sensor module with UART interface, measuring 400-2000ppm for indoor air quality applications. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsenseair.com%2Fwp-content%2Fuploads%2F2024%2F07%2FPSP126.pdf&ref=openhardware.directory&product=open-air-mini&source=md-export)

## Protocols

- **I2C**
- **UART**
- **PWM**

## GPIO Map

| Pin | Name | Type | Functions |
|-----|------|------|-----------|
| GPIO33 | Status LED | — | — |
| GPIO15 | PWM Motor Output | — | — |
| GPIO14 | RPM Pulse Counter Input | — | — |
| GPIO13 | UART Sensor 2 RX | — | — |
| GPIO12 | UART Sensor 2 TX | — | — |
| GPIO25 | UART Sensor 1 RX | — | — |
| GPIO26 | UART Sensor 1 TX | — | — |
| GPIO19 | I2C Sensor 2 SDA | — | — |
| GPIO18 | I2C Sensor 2 SCL | — | — |
| GPIO16 | I2C Sensor 1 SDA | — | — |
| GPIO4 | I2C Sensor 1 SCL | — | — |

## Description

The Open AIR Mini is an open-source ventilation controller designed to bring smart home control to mechanical ventilation units commonly found in European homes. Built around an ESP32 microcontroller, it replaces or augments the factory controller in Ducobox Silent, Ducobox Focus, Ducobox Reno, and Orcon MVS-15xx ventilation systems, providing full WiFi connectivity and Home Assistant integration through ESPHome firmware.

The board features an onboard Mean Well AC-DC converter that powers the system directly from 230VAC mains, eliminating the need for external power supplies. It provides regulated 5V and 3.3V rails for sensors, a 3.3V supply for the ESP32, and a 10V reference output for motor speed control via a 0-10V PWM interface. Two sensor connectors support a variety of optional environmental sensors including the Sensirion SCD-4x for CO2 measurement, SHT-4x for temperature and humidity, SGP41 for VOC and NOx indices, and the legacy Senseair S8 CO2 sensor via UART. Five status LEDs monitor each power rail, while the ESP32 onboard LED indicates system health.

With full OTA update support and a built-in web server, the Open AIR Mini can operate autonomously in disconnected mode using humidity-based fan speed thresholds, or be fully orchestrated through Home Assistant automations. The hardware design files, including schematics, BOM, Gerber files, and 3D STEP models, are published under the GPL-3.0 license on GitHub, making it a truly open platform for demand-controlled ventilation.

## Where to Buy

- [Tindie](https://openhardware.directory/r?to=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Ftheflamingo%2Fopen-air-mini%2F&ref=openhardware.directory&product=open-air-mini&source=md-export) — $69.95

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.tindie.com%2Fproducts%2Ftheflamingo%2Fopen-air-mini%2F&ref=openhardware.directory&product=open-air-mini&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FFlamingo-tech%2FOpen-AIR&ref=openhardware.directory&product=open-air-mini&source=md-export)
- [schematics](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FFlamingo-tech%2FOpen-AIR%2Ftree%2Fmain%2FOpen%2520AIR%2520Mini%2FHardware%2FOpen%2520AIR%2520Mini%2520V1.5&ref=openhardware.directory&product=open-air-mini&source=md-export)

## Tags

`ventilation`, `hvac`, `esphome`, `home-assistant`, `esp32`, `open-source`, `air-quality`, `co2-sensor`, `smart-home`, `ducobox`, `orcon`

## Images

![Open AIR Mini](https://nbg1.your-objectstorage.com/openhardware-directory/entities/open-air-mini/cc6ec137ebb3.jpg)

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